Yes you can use "T" nuts if you wish. No problem there. I use Dave Brown mounts a lot. I drill and tap them for 4-40 cap screws. I drill all the way through the mount arms. I then use a tap and cut threads in the mount. I use hardened cap screws to hold the engine on. I have yet to eveen have a srew come loose. Do not use thread locker on the mount it will melt the plastic. The mount will hold the screw well without it. Good luck.

Mark Shuman